crenel vs furnish

crenel is a noun but furnish is not a noun.

Word	Noun	Adjective	Verb	Adverb
crenel	Yes	No	Yes	No
furnish	No	No	Yes	No

As verbs, furnish is a hypernym of crenel; that is, furnish is a word with a broader meaning than crenel:

Other hypernyms of crenel include offer, provide, render, supply.

crenel (noun)	furnish (noun)
a notch or open space between two merlons in a crenelated battlement
one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.)

crenel (verb)	furnish (verb)
supply with battlements	give something useful or necessary to
	provide or equip with furniture